Closure for hand-holes.



K. M. DA'HL. GLOSURE POR HAND HOLES. "APPLIGATIoN FILEDAUazo, 1912.

Patented July 29,1913.;

FMEA..

. To all 'whom it may concern: y y e `Beit known that I, KNUT M. DAHL, `a

j citizen of the United States, residing 'city and countyof San Francisco,` State of .Ca1ifornia,.have' invented a new and'us'eful i STAT-Es' PATENT OFFICE.

IINUT M. DAHL, OF sAN FRANCISCO, oALIrORNIm AssIGNoR ro UNION IRON WOR-Ks co., or SAN rRANcIsco, CALIFORNIA, A ooRrORArIoNor NEW JERSEY.

-oLosURE FOR HAND-Horns.

noname.

Specification of Letters Patent.

Application filed August 20, 1912. Serial N o. 715,984. f

in the Closure for Hand-Holes, Ofhwhich vthe ffolvIn closures, as heretofore constructed, it`

lowing a specification. l l, c 4 This invention relates to closures or covers .for hand holes or manholes and has .for its 10.

object -t9 provide a .closure whichV can,v be placed '1n operative position or removed 'therefrom without. the use of independent VWrenches or othertools.l .f

` xIt .has for a further object-to provide a closure which is simple in construction, cornbut few parts and operates in an efective and positive manner.

is a requirement that some tool or wrench Independent and. 'separable lfrom the closure utilized in order to secre the closure in remove a 'closure wit as/eparate tool and in operative and leak proof position. Owing `to the fact'that-closur'es-are generally located obscure and feomfarativel" inaccessiblel places it is, exfeedili y diilie' t toattach Or the operationthe said tool or wrench is frequently dropped` and` lodges behind pipes, boilers,purnps. orfthe like causing great in-4 convenience and delay. By my present in 'vention such diiculties are overcome and eliminated and each closure is provided with itsfownoperative mechanism which forms substantially an integral part thereof.

It further consists of other novel features Vof construction, all as will be hereinafter tory and reliable results5 although it is to be understood'that the various instrumen,- talities of which my invention consists can be variously arranged and Organized and -that my invention is not limited to .the precise arrangement and organization Iof these h instrumenta-1 itiesY as herein. shown andv de- '5eA i .Figure 1 represents a plan of a closure scribed. V

deviceembodying my inyentionv the same being illustrated as applied toafuel' o1l strainer.. Fig. '-2 represents a section on line vof course depends on the configuration of the opening to which the 'closure 'is applied. As-here shown the body portion 1 is provided with an annular circumferential ange 2, the innerwall 3 of which continues as the top of the body portion 1 and forms a seat 4 forca plate 5, 'this latter being fixed by.

bolts or screws 6 or like fasteningmeans to the body 1. The body portion 1 is preferably provided with a recess or pocket 7 serv'- LugV to receive a nut 8 which is secured to a Olt or stem 9 in any desired manner. The

`bolt or stem 9 passes through` an aperture 10 in the plate 5 ,and has an enlarged portion 11 threaded for engagement with a cross bar 12 which serves as a fulcrumto cause proper 'actuation of the movable parts. In the'pres- Patentedouiyao, 1913.

ent .instance the cross vbar 412 terminates in oppositely disposed hook ,members 13, the function of which is to engage or interlock with the neck portion 11i of studs 15, and

bein prevented from displacement by the studeads 16. These studs 15have a threaded end 17 for attaching them to a suitable fixed part, of the body or casing 21.

18 designates an arm for operating the bolt 9which passes transversely thereof and` cent adjuncts for the purpose of locking the parts in normal position, and thus the clamping mechanism of the closure performs the double function of\ retaining certain auxiliary elements in assembled condition.

In the operation of the device the bod portion l of the closure is inserted inthe desired opening and the st-uds 15 screwed into position on either side thereof. It will be'vunderstood thatthe bolt 9 is. permanentlysecured to the closure body 1, as already described and .forms a part thereof.

The cross bar 12 is now swung about the bolt as a pivot to bring the hook members 13 into interlocking engagement With the studs 15 whereupon the arm 18 may beV turned to force the body portion 1 into the opening. It is preferable to provide a gasket or other suitable packing 20 beneath the flange 2 in order to prevent any leakage at the joint. It will be apparent that as the threaded stem or body 11 is rotated in the act of forcing the closure 1 into position the top surface of the hooks 13 will contact With the undersides of the heads 16 so that a tight and effective joint is maintained under all conditions. When it is desired to obtain access to the interior of the casing or body 21 by rotating the arm 18 in the stem 11 in the desired direction, the closure 1 .will be readily unseated, the cross bar 12 can then be rotated so that the hooks 13 move out of engagement with the portions 14 and 15 and the closure can be readily lifted so as to give access to the strainers 22.

It will be apparent that my novel construction of closure and its adjuncts may be capable'of general adaptation but in the present instance I have shown the same as especially applicable tol an oil straining clevice comprising a plurality of apertured baskets 22 which are held in a suitable portion of the casing or body 21 and adapted to coast With a novel valve mechanism. The construction of the valve for the straining devices need not here be described in detail since the vsame per se forms the subject matter of a prior pending application filed by 'me on February 20, 1912, Serial No.

678,861 the present invention relating particularly to the closure device the bottom portion 19 of which is adapted to contact and coact with the bail 23 for the strainer device 22.

The oil strainer device hereinabove re? yferred to is especially adapted in oil burnto cause the Wrench or other manually opera'ted tool to become displaced from proper position, it is exceedingly fdesirable to ."ernploy a self contained device which can be readily and manually operated Without the employment -of extraneous devices, as will be apparent'to those skilled in this-art.'

-Having thus described my -.invention,'

What I claimas new and desire to secure by Letters Patent, is y 1. In a device of the'character, stated, a closure comprising a recessed body porti-ion,

a threaded stem having its lower head swiv-v eled in said recess, a plate'covering said recess and confining said head therein, au

casing'upon .which said"`clsure is adapted to seat, oppositelylocated studssecured to said casing and terminating in heads, a cross bar having hooks on the extremities thereof adapted to interlock Withsaid studs, said cross bar being in threaded engagement With the body of said stem, and a transverse arm mounted on the upper extremity of the latter and seat-.1`

said studs, a boss 19 projecting from the side of said closure opposite said recess, said boss being adapted to engage a member removably contained Within said casing, and an arm secured to said stem to rotate the same, whereby said cross arm is. moved to simultaneously lock said closure and said removable member to said-casing; r

f K NT; M. DAI-IL.` IVitnesses: Y

MAURICE Asrrna,

` Fransman BrnDsALL. A 

